How to let Autonav 'stick' to top of browser

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Hello, This is my first post here and I hope someone can help me.

I'm editing the website for my band MaxiFusion. I want the AutoNav menu (which is a Header Menu btw) to stay on top of the browserscreen, when people scroll down a page (like in this example:http://fiddle.jshell.net/zsJAr/show/light/... ). Is there a way to do it in Concrete5?
The site where the problem resides ishttp://www.maxifusion.nl. I already got it so far that the AutoNav menu is fixed on the screen, but it doensn't give me a nice result (as you can see, when you go to the site :) )

Does anybody know a way to make it possible to make a 'sticky' menu?

thanks in advance